Truncate long texts with ellipsis instead of auto-adjusting of window width

- the truncated text is still available in its original form but user
  must resize the window on his own to see the complete text
- word wrapping is enabled too but it doesn't work for long words
- not adding horizontal scrollbars because it looks horrible and is
  non-user-friendly

- closes rhbz#919796

Signed-off-by: Jakub Filak <jfilak@redhat.com>